#define _CRT_SECURE_NO_WARNINGS

#include<iostream>

using namespace std;

class Sum
{
public:
	Sum()
	{
		_ret += _i;
		_i++;
	}

	static int Getret()
	{
		return _ret;
	}

private:
	static int _i;
	static int _ret;
};

int Sum::_i = 1;
int Sum::_ret = 0;

class Soution
{
public:
	int Sum_Soution(int n)
	{
		Sum a[10];
		return Sum::Getret();
	}
};

int main()
{
	cout<< Soution().Sum_Soution(10) << endl;
	return 0;
}